Community Notebook: Kernel News

Miklos Szeredi announced his own attempt at a union filesystem, in other words two distinct filesystems that are overlayed so as to appear as one. The two filesystems are ranked “upper” and “lower,” so if a file in one filesystem has the same name as a file in the other, only the file in the upper filesystem will be displayed to the user. But, if a directory in one filesystem has the same name as a directory in the other, the two directories are presented as one.